How to Pick and match the inventory_hostname against {{ ansible_hostname }} using groups.hosts

[rrak...@gmail.com]

Hi Experts,

---

- hosts: all

  remote_user: root

  tasks:

  - name: test variable

    shell: echo "setosprov-04.sh -o OSLABEL -b SITE hostinfo={{ ansible_hostname }}:{{ ansible_default_ipv4.address }} CIC0" 

    #when: inventory_hostname == "{{ inventory_hostname }}"

    when: inventory_hostname == groups.hosts

My hostvar inventory as below:

[hosts]

host-test1

host-test2

noi-pranjala

[hosts:vars]

ansible_ssh_user=root

Now i'm checking where "{{ ansible_hostname }}" should match the each   "{{ inventory_hostname }}"  and if  "{{ inventory_hostname }}" matches with  "{{ ansible_hostname }}"  then proceed otherwise fail.

I tried using "when: inventory_hostname == groups.hosts"  it didn't pich the hostnames Serially hence its getting failed, So, how to ensure the each "{{ inventory_hostname }}"  can be red serially so it can run to all the hosts in a sequence so it may match the hostname correctlt and compare the condition.

[Brian Coca]

First of all you are comparing a string (inventory_hostname) to a list
(groups.hosts, which is [host-test1, host-test2, noi-pranjala]).

if you want to match inventory-hostname to ansible_hostname, just do that:


when: inventory_hostname == ansible_hostname


that will skip the task when they don't match.


if you want the task to actually fail:


failed_when: inventory_hostname != ansiblie_hostname


----------
Brian Coca

[rrak...@gmail.com]

@Brian ,  Thanks a lot for your suggestion, this looks Great,

What about "when: inventory_hostname == groups.hosts"  when: inventory_hostname == groups.hosts[0] , i google around but did not get clear & explicit explanation about its usage

[Brian Coca]

This is invalid, as i explained above:
when: inventory_hostname == groups.hosts"


This works when the 'current host' is also the 'first host in the
group', here [0] is an index on the list that is group.hosts, so it is
a valid comparison.

when: inventory_hostname == groups.hosts[0]

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--
----------
Brian Coca